National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

22°F

-6°C

Humidity 56%
Wind Speed W 15 G 18 mph
Barometer 30.15 in
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill9°F (-13°C)
Last update 17 Mar 12:55 am CDT
Extended Forecast for

Troy IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 15. Northwest wind around 14 mph, with gusts as high as 23 mph.

    Low: 15 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 34. Northwest wind 6 to 10 mph becoming southwest in the afternoon.

    High: 34 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A chance of snow before 4am, then a slight chance of rain. Cloudy, with a low around 30. Southeast wind 5 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.

    Low: 30 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: Mostly sunny, with a high near 63. South wind 10 to 14 mph becoming west in the afternoon. Winds could gust as high as 21 mph.

    High: 63 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 43. South wind 3 to 5 mph.

    Low: 43 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 15. Northwest wind around 14 mph, with gusts as high as 23 mph.
Tuesday
Increasing clouds, with a high near 34. Northwest wind 6 to 10 mph becoming southwest in the afternoon.
Tuesday Night
A chance of snow before 4am, then a slight chance of rain. Cloudy, with a low around 30. Southeast wind 5 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.
Wednesday
Mostly sunny, with a high near 63. South wind 10 to 14 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
Wednesday Night
Mostly cloudy, with a low around 43. South wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 72.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 76.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 50.
Sunday
Sunny, with a high near 70.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Troy IL
 38.74°N 89.89°W (Elev. 551 ft)
Last Update:
12:11 am CDT Mar 17, 2026
Forecast Valid:
1am CDT Mar 17, 2026-6pm CDT Mar 23, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation